AltspaceVR is described as 'social VR platform for meeting people from around the world, playing interactive games, and attending free live events. Choose from over 28 activities or attend live events with comedians, DJs, authors, celebrities, and more' and is an app in the Social & Communications category. There are more than 10 alternatives to AltspaceVR for a variety of platforms, including Windows, Oculus Rift, Online / Web-based, Mac and Android. The best alternative is Second Life, which is free. Other great apps like AltspaceVR are Hubs by Mozilla (Free, Open Source), VRChat (Free), ActiveWorlds (Free) and IMVU (Freemium).
Second Life is a free 3D virtual world where users can socialize, connect and create using free voice and text chat. To access this world you need to use a viewer such as Second Life Viewer (see Second Life Viewer).
Activeworlds hosts a Universe of over 500 3D virtual reality worlds. In these worlds you can choose from a vast array of avatars that fit your personality (or your perceived personality - that's half the fun!).
In Facebook Horizon, not only can you explore the virtual world as it grows and changes, but you can discover all sorts of new things that interest and inspire you. Experience gravity defying, distance spanning, genre bending games of all types.